Carburetor



Patented F eb. 3, 1925.

UNITED STATES l, 1,524,865 PATENT OFFICE.

FOREST .V. HUG'liIlElS,` OF INDIANAYOLIS, INDIANA, ASSIGNOR T0 THE WHEELER- SCHEBLER CARBURETOR COMPANY, INC., OF INDIANAPOLIS, INDIANA. A COR Poa'rIoN or INDIANA.

CARBURETOR.

Applicatin filed April 9, 1921. serial No. 459,890.

To allee/m 'it may concern;4

Be it known that I, FOREST V. HUGHES,

a citizen of the United States, residing at Indianapolis, in the county of Marion and 5 State of Indiana, have invented a new and useful Carburetor, of whichlthe following is a specification. l

' It is the object of myrinventionto provide a fuel-control needle for carburetors, 22

ventlon, all the parts except the needle.

proper being shown only conventionally; Fig. 2 is a longitudinal section through the needle mounting, being takenvsubstantially onthe line 2-2 ofl Fig. 3; Fig. 3 is an elevation of the needle and its mounting; Fig. 4 is a section on the line 4 4 of Fig. 2, but with thefstem in elevation; Fig. 5 is an enlarged plan of the cupped cap in which the needle is mounted, the needle itself being removed; Fig. 6 -is an enlarged perspective view of the stem of the needle-raiser; and Fig. 7 is an enlarged perspective view of the nut in which the needle has a screw-threaded mounting.

The carburetor may be of any desired type, ordinarily including a float chamber 10 from which fuel is supplied by a passage 11 to a fuel nozzle 12 which suitably dscharges within a venturi 13 in the air passageway 14, Vthe air passage being controlled byl the usual throttle 15. These parts 4are all shown conventionally, and may be varied or supplemented atpleasure.

The entrance to the fuel passage 11 from the float chamber 10 is'controlled by a needle 16. This needle is provided with a screwthreaded shank 17 above which is a head 18 and a knurled thumb piece 19.4 Thev screw-threaded shank 17 is mounted in a nut 20, shown in detail in Fig. 7 'This nut is provided with a transverse slot 21 passing almost entirely through it, so that the parts above and below the .slot may be sprung slightly toward each other, by the yielding of the metal joining them at one edge, -vso that a spring clamping action on the threaded shank`17 is obtained and wear is taken up and lost motion is eliminated between the needle and the nut.v The nut 20 is .cut away at the bottom on one side, to provide a flat downwardly facing shoulder The nut 2O is slidably mounted in a cup 23, the bottom of which is provided with a central hole, to allow the needle 16 to project through it, and this cup 23 has a cylindrical downward extension 24 which has a removable mounting in a circular hole 25 in the top of the oat chamber 10 in line with the entrance to the fuel passage 11. The mounting of the extension 24 in thev hole 25 permits the cup 23 to be turned in such hole to any desired position, in which it may be clamped by a set screw 26 cooperating with a. circumferential groove 27 in suchv eXtension 24. i

The upper end of the cup 23 is externally threaded, to receive a cupped cap 28 which surrounds thev head 18. This cupped cap has an inwardly extending flange 29, which acts as an abutment for a compression spring 30 which presses downward. on the nut 20, so that by this spring action the nut 20 is normally seated in the bottom of 'the cup 23. The downward pressure of thespring 30 on the nut 20 also presses together the two parts of such .nut on opposite sides of the split 21, to maintain constantly the spring clamping action already referred to.

The head 18 has a transverse opening 31 through it, in opposite ends of which opening are mounted two balls 32 which are spring-pressed apart by .a compression spring 33 between them. The ends of the opening 31 are preferably peaned inward slightly after the balls 32 are put in place, to prevent such balls fromcoming out if the needle is removed from the cupped cap 28. These balls 32 project slightly outward beyond-the periphery of the head. 18, and are spring-pressed by the spring 33 into en. gagementfwith the inner surface o f the cupped cap 28, which inner lsurface is provided with longitudinal flutes 34, as is clear from Fig. 5. Thus by turning the knurled thumb piece 19 of the needle 16', such needle 'is adjusted longitudinally by being screwed provided with a clamping screw 49.

adjusted position by the cooperation of the spring-pressed balls 32 with the flutes 34. The spring action of the spring 33 is balanced' on the needle, so that no tendency to cock the needle is created.

The cup 23. has a lateral hollow projection 35 in which isv rotatably mounted a needle-raising stem 36, which is held in place in the hollow projection 35 by a screw 37 cooperating with a circumferential groove 38 in such stem. The inner en'd of the stem 36 is cut away on its upper side to provide an upwardly facing shoulder 39 which lies beneath the shoulder 22 of the nut 20, but rather closethereto, so that when the stem 36 is rotated the two shoulders 39 and 22 engage and the nut 20 is lifted. Near its outer end the stem 36 is provided with a radially outwardly projecting stop segment 40, which lies in an annularly longer recess 41 in the outer end of the project-ion as is clear from Fig. 4, so that the .turning movement of the stem 36 is limited to the difference in the annular extent between the segment 40 and the recess 41-as shown, about 90. The outer end 42 of the stem 36 is made slightly smaller than the remainder thereof, and on this portion 42 is clamped a split crank armv43, the clamping being by a screw 44 .acting between the two parts on opposite sides of the split. By loosening the screw 44 the crank arm 43 may be set to any angular position on the stem. vThe crank arm 43 is conveniently operated by a flex- Aible wire 445,. which passes through a' tube l46 the end` of which is clamped by a screw 47 in the end of an arm 43 which is clamped upon vthe round outer end of the projection 35 byvbeing split at such mounting alid Y loosening the clamping screw 49, theI arm 48 may be adjusted to any desired position around the axis` of the -stem 36, to correspond to the position to which the crank arm 43 is adjusted, so that the wire 45 and tube 46 may extend from the needle at any desired angle with respect to such stem. This provision, with the provision for adjusting the cup 23 about the axis of the needle 16 by first loosening the -screw 26, makes it possible to get a. universal adjustment of. the direction in which the wire 45 and-tube 46 extend from the carburetor, so that the carburetor may be set in any position de'sired with respect to the dash board or other place of control.

n operation, the parts are normally in the position shown, with the nut 20 resting againstthe bottom of the cup 23, and with a slight clearance between the shoulders 22 and 39. The needle 16 is adjusted for normal fuel delive by manipulating the knurled thumb piece 19, which moves the needle axially with respect to the nut 2O.l

lVhen in operation it is desired to get :i greater fuel supply temporarily, as for warming up the engine 1n starting, the wire 451s pulled lto turn the crank arm 43 in a clockwise direction from the position shown in Fig. 3, so that the shoulder 39 engages the shoulder 22 and lifts the nut 2U against the action of the spring 30, thus lifting the needle 16 and increasing the inlet opening to the fuel passage 11. "If the arm 43 is swung in a clockwise direction sufficiently far", the anglebetween the shoulders 39 and 22 is increased sufficiently so that the nut 2O will be held in raised position without a continual pulling on the wire 43. Then the engine is warmed up sufficiently, the wire 45 is pushed in again, to return the needle 16 to its normal position. i

l claim as my invention:

l. In a carburetor, the combination of a fuel-controlling needle, a nut in which said needle has a screw mounting, a cup in which said nut is slidable and is spring-pressed to a seat in the bottom of the cup, and means for shifting said nut against its spring pressure longitudinally of the cup to increase the supply of fuel controlled by said needle.

2. In a carburetor, the combination of a fuel-controlling needle, a nut in which said needle' basa/screw mounting. a cup in which said nut-is 'slidable. and means for ,positively shifting said nut longitudinally of the cupto increase the supply of fuel controlled by said needle.

ln a carburetor, the .combination of a fuel-controlling needle, a nut in which said needle has a screw mounting, a cup in which said nut is slidable, means for shifting said nut longitudinally of the cup, said needle having through it a transverse opening in which two outwardly spring-pressed balls are mounted, and an internally longitudinally fluted member with the flutes of which said balls engage to hold the needle in adjusted posit-ion circumferentially,while permitting it and the nut to be moved axially.

4. In a carburetor. the combination of a fuel-controlling needle, a nut in which said needle has a. screw mounting, means 4for Shifting said nut axially to Vary the needle position, said needle having; through it a transverse opening in which two outwardly spring-pressed balls are mounted, and an internally longitudinally fluted member with the flutes'o-f which saidcballs engage to hold the needle in adjusted psition circumferentially while permitting it and the nut to .be moved axially.

5. In a carburetor, the combinationof a fuel-controlling needle, a nut in which said needle has a screw mounting, a cup in which said nut is slidable, means for` positively shifting said nut longitudinally of the cup, and a support in which said cup lil() is circumferentially adjustable to diiferent fixed positions.

6. In a carburetor, the combination of a lfuel-'controlling needle, a nut in which said needle has a screw' mounting, a cup in whichsaid lnut is slidable, and a transverse rotatable stem mounted in Said cup, said nut and said stem having cooperating shouldeis whereby the turning of said stem shifts said nut and needle axially.

7. In a carburetor, the combination of a fuel-controlling needle, a nut in which said needle has a screw mounting,y a cupin which said nut is slidalble, a transverse rotatable ste-m mounted in said cup, said nut and said stem having cooperating shoulders whereby the turning of said stem shifts said nut and needle axially, and a supportl in which said cup is eircumferentially adj ustable.

8. In a carburetor, the combination of a fuelco1'1trollngneedle, a nut in which said needle has a screw mounting, a cup in which said nut is slidable, a transverse ro'- tatable stem mounted .in said cup, said nut and said stemhaving cooperating shoulders whereby the turning of said stem shifts mounted on said stem and adjustable to different angular positions thereon, an operating wire extending from said crank arm, a supporting arm mounted on said cup and adjust-able to different angular posi.l tions thereon about the axis of said stem, and a tube supported by said supporting arm and through which said Wireguidingly extends.

10. In a carburetor, ,the combination of a fuel-controlling needle, a nut in which said needle has a screw mounting, a cup in which said nut is slidable, a transverse r o tatable stem mounted in said cup, said nut and said stem having cooperating shoulders whereby the turning of said ,stem shifts said nut and needle axially, a lcrank arm mounted on said stem and adjustable to different angular positions thereon, an operating wire vextending from said crank arm, and a support in which said cup is circulnferentia-lly adjustable.

lll In a carburetor, .the combination of a fuel-controlling needle, a. .nut in which said needle has a screw mounting, a cup in which said nut isslidable, a transverserotatable stem mounted in said cup, said nut and said stem having cooperating shoulders whereby the' turning of said stem shifts said nut and needle axially, a. crank arm mounted on said stem and adjustable to diierent angular positions thereon, an operating wire extending from said crank arm, a supporting a'rm mounted on said cup and adjustable to dii'erent angular positions thereonA about the axis of said stem, a tube supported by said supporting arm and through which said wire guidngly extends, and a support Vin which said cup is circumferentially adjustable.

12. .In a carburetor,l the combination of a fuel-controlling needle, a nut in which said needle has a. screw mounting, lsaid nut being partly split transversely and the two parts on opposite sides of said split being relatively sprung to provide a spring clampingV action on the needle, a cup in which said nut is slidable,'means'for shifting said nut longitudinally of the cup, and a spring acting on said nut tending to move it in such cup and tomaintain constantly -ing on said nut tending to spring suc two nutparts together to maintain -constantly such spring clamping action.

In witness whereof, I have hereunto set my hand at Indianapolis, Indiana, this 6th day of April, A. D. one thousand nine hundred and twenty-one.

FOREST v. HUGHES. 

